Excitation of a global plasma mode by an intense electron beam in a dc discharge

Sydorenko, D.; Kaganovich, I. D.; Ventzek, P. L.  G.; Chen, L.

doi:10.1063/1.5018427

Title: Excitation of a global plasma mode by an intense electron beam in a dc discharge

Journal Article · Mon Jan 01 00:00:00 EST 2018 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5018427· OSTI ID:1433301

Sydorenko, D. ^[1]; Kaganovich, I. D. ^[2]; Ventzek, P. L. G. ^[3]; Chen, L. ^[3]

Univ. of Alberta, Edmonton, AB (Canada). Dept. of Physics
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Tokyo Electron America, Inc., Austin, TX (United States)

The interaction of an intense electron beam with a finite-length, inhomogeneous plasma is investigated numerically. The plasma density profile is maximal in the middle and decays towards the plasma edges. Two regimes of the two-stream instability are observed. In one regime, the frequency of the instability is the plasma frequency at the density maximum and plasma waves are excited in the middle of the plasma. In the other regime, the frequency of the instability matches the local plasma frequency near the edges of the plasma and the intense plasma oscillations occur near plasma boundaries. The latter regime appears sporadically and only for strong electron beam currents. This instability generates a copious amount of suprathermal electrons. Finally, the energy transfer to suprathermal electrons is the saturation mechanism of the instability.

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Research Organization:: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: AC02-76CH03073

OSTI ID:: 1433301

Alternate ID(s):: OSTI ID: 1414608

Journal Information:: Physics of Plasmas, Vol. 25, Issue 1; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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